What is a matrix?
A matrix is a rectangular array of numbers arranged in rows and columns. Matrix size is written as rows x columns.
Matrix multiplication explained
Matrix multiplication combines rows of the first matrix with columns of the second matrix. The number of columns in A must equal the number of rows in B.
What is a determinant?
A determinant is a special number calculated from a square matrix. If the determinant is zero, the matrix has no inverse.
Solving simultaneous equations with matrices
A system of equations can be written as Ax = b. Matrix methods solve for the unknown vector x using elimination or the inverse matrix when it exists.